Once water is in a mix, I am not an advocate of not using a preservative. Unless the product is used within 2 days.

There are other ingredients more powerful than Vitamin C, and yield faster and better results. My two favourite ingredients are Pycnogenol and Matrixyl.

Indeed, I use Phenoxyethanol (a few drops as a preservative)... However the SKB / Sea Kelp Bioferment also has the same ^^ preservative

The SKB has a preservative already so I use the same one just a few drops...

Okay, do not use more percentage of a preservative for the amount of your batch. Too much preservative in a batch, is as dangerous as too little . Keep in mind the percentage of preservative in an ingredient, is only enough to preserve the ingredient

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